Very Computer

Hello

after reading apple's web site several times, I still don't understand how
to use carbon events. ( i guess i'm missing something essential because i
can't find the mecanism that is translating message)

I'm looking for a minimal example , something like ( pseudo code here )  :

void main( void )
{

 myWin = CreateWindow( blabla )
SetEventHandler( myWin, myProc )

 while( true ) { }

Quote:}

bool myProc( event )
{
    if event == quit then
       alertbox( "The user wants to quit" ) ;
     quit program
   end if
     return defaultWindowProc;

Quote:}

thank you

Here's some window-level event code, perhaps it will help. You'll also
need a main event loop where you first call
InstallApplicationEventHandler and then RunApplicationEventLoop.

void createWindow() {
        WindowAttributes        windowAttrs;
        OSStatus                        err;

        windowAttrs = kWindowCloseBoxAttribute |
                                  kWindowCollapseBoxAttribute |
                      kWindowStandardHandlerAttribute;
        err = CreateNewWindow (kDocumentWindowClass, windowAttrs, &border, &window);
        assert(err == noErr, "Error creating window");

        // Event handling
        InstallStandardEventHandler(GetWindowEventTarget(window));

        EventHandlerUPP         handlerUPP;
        EventTypeSpec           eventTypes[] = {
                { kEventClassWindow,
kEventWindowDrawContent },
                { kEventClassWindow,
kEventWindowUpdate },
                { kEventClassWindow,
kEventWindowShown },
                { kEventClassWindow,
kEventWindowClose}
        };

        handlerUPP = NewEventHandlerUPP(windowHandleEventGlue);
        InstallWindowEventHandler(window, handlerUPP, sizeof(eventTypes) /
sizeof(EventTypeSpec), eventTypes, (void *)this, null);

Quote:}

pascal OSStatus windowHandleEventGlue(EventHandlerCallRef nextHandler,
EventRef theEvent, void *userData) {

        OSStatus        status = eventNotHandledErr;    

        UInt32  eventClass = GetEventClass(theEvent);
        UInt32  eventKind  = GetEventKind(theEvent);

        switch (eventClass) {
        case kEventClassWindow:
                switch (eventKind) {
                case kEventWindowClose:
                case kEventWindowDrawContent:
                case kEventWindowUpdate:
                case kEventWindowShown:
                        // Do something here
                        status = noErr;
                        break;
                }
                break;

        default:
                break;
        }

        return status;

Quote:}

Thanks a lot !!!

I didn't know about the existence of RunApplicationEventLoop, it does not
appear anywhere on the pages i visited !

thank you !

I am pretty sure that the Sample Code page
(developer.apple.com/samplecode) has adequate Carbon Events samples, but
I am behind a slow link now, so I can't check for you

hth

meeroh